Oxygen solubility in dysprosium mononitride prepared by carbothermic synthesis

Abstract

Dysprosium mononitride was prepared by carbothermic reduction of the sesquioxide in nitrogen gas stream. A variety of the initial C/Dy molar ratios were chosen to prepare the series of Dy(N, O) solid solutions. The residual carbon in the products was removed by additional heating with nitrogen and hydrogen mixed gas stream. The lattice parameter and composition of Dy(N, O) were determined by X-ray diffraction and quantitative analyses on N, O, and C. The lattice parameter of Dy(N, O) decreased with increasing oxygen content. The oxygen solubility in DyN–Dy 2O 3 pseudo-binary system under 1 atm of nitrogen increased linearly with increasing temperature from ∼9 mol% DyO at 1623 K to ∼14 mol% DyO at 2075 K.